ObjectDB Database Search

-Jar xyz.jar", I get either empty results or on some cases a "NoResultException" which appears ... Hansen Empty results or  NoResultException may be caused by accessing an empty database. In ... you are trying to access the database in a wrong location? In that case, a new empty database

Possible issue for JPQL IS EMPTY comparison expression: SELECT e FROM MyEntity e WHERE e.collection-valued IS EMPTY throws javax.persistence.PersistenceException: Invalid operand type  for operator IS EMPTY (error 756) Thanks. Note: It doesn' t work with SIZE(): SELECT e FROM MyEntity e

to my inquiry a few months ago. However, I have run into one problem: if an embedded collection is empty ... of the first collection, the result of the overall query is an empty set. To use the example from ... class C { @Id long id; List bList; }; If I have an instance of C where bList is empty , the following

is emptied , but not null. So, my @ElementCollection Set fields become empty sometimes during development ... , until 1 day ago, when some fields got empty again (but not null). (basically...an empty HashSet

are empty (""). To avoid unnecessary memory consumption, the String within the entities are initialized like: String firstName = ""; In this case every " empty " attribute shares the same String. But after reloading the entities from objectdb, every empty String has become a new (unique) String

. Please try it. support Support I'm now getting an empty set returned on empty database. Thanks!!!! pedwards Paul Edwards

of the first one) empty . Or rather pre filled with null. We observed that the directory is cleaned

. as  path expressions - in navigation to persistent collection fields. IS [NOT] EMPTY The IS [NOT] EMPTY operator checks whether a specified collection is empty or not. For example: c.languages IS EMPTY is TRUE if the collection is empty and FALSE otherwise. c.languages IS NOT EMPTY is FALSE

Log is almost empty (log level 'trace')

Handling a case of searching an empty database

all the persistent fields, but the [Summary] view is initialized as an empty view. Therefore, unless set, persistent objects are presented in the Tree viewer as an empty set of fields (using

above). To obtain a connection to an empty database (discarding existing content if any) the drop parameter ... ("objectdb:myDbFile.tmp;drop"); Getting an empty clean database easily is very useful in tests. However, to avoid

configuration file contains an empty element. If the element is not empty ObjectDB tries to apply

defines all the supported callback methods with empty implementations: @Entity public static class

: =, , =, IS [NOT] NULL, [NOT] BETWEEN, including  Collection operators: [NOT] IN, IS [NOT] EMPTY

_TIMESTAMP,DELETE, DESC, DISTINCT, ELSE, EMPTY , END, ENTRY, ESCAPE, EXISTS, FALSE, FETCH,FROM, GROUP

. literal (Integer.ValueOf(2)); Expression d = cb. literal (3.4); // String literals: Expression empty

can be used to represent the ObjectDB installation directory, as demonstrated above. If the path is empty

use JPA criteria query API, and I pass an empty collection to IN expression: CriteriaBuilder cb ... )); //templateKeys is empty by mistake List services = em.createQuery(cq).getResultList(); As exception itself is nothing wrong here I guess (at least other JPA providers also throw on empty IN parameter

;collection) Create a predicate that tests whether a collection is empty . Parameters: collection - expression Return: is- empty predicate Since: JPA 2.0 Predicate isFalse ( Expression  x) Create ... that tests whether an element is a member of a collection. If the collection is empty , the predicate

. Returns empty set if the managed type has no declared attributes. Return: declared attributes ... -, List-, and Map-valued attributes) declared by the managed type. Returns empty set if the managed ... the single-valued attributes declared by the managed type. Returns empty set if the managed type

() Return the attributes declared by the managed type. Returns empty set if the managed type ... attributes) declared by the managed type. Returns empty set if the managed type has no declared multi ... declared by the managed type. Returns empty set if the managed type has no declared single-valued

getDeclaredAttributes () Return the attributes declared by the managed type. Returns empty set ... attributes) declared by the managed type. Returns empty set if the managed type has no declared multi ... empty set if the managed type has no declared single-valued attributes. Return: declared single-valued

Since: JPA 2.0 List getGroupList () Return a list of the grouping expressions. Returns empty list ... . Returns empty list if no ordering expressions have been specified. Modifications to the list do not affect ... the parameters of the query. Returns empty set if there are no parameters. Modifications to the set

desktop lists all the persistent classes in the database. For a new, empty database this window is empty . A new persistent class is automatically added to the database when its first instance is stored ... " are initialized to contain all the persistent fields, but the "Summary" is initialized as an empty view

getCorrelatedJoins () Return the correlated joins of the subquery. Returns empty set if the subquery ... . Returns empty list if no grouping expressions have been specified. Modifications to the list do not affect ... Subquery itself, including any subquery roots defined as a result of correlation. Returns empty set

empty (not the first run), a previously stored ArrayList instance is expected to be retrieved from ... and a new empty ArrayList instance is created (line 24). The new ArrayList instance is bound ... in the package (e.g. line 6). Both and elements must have a name attribute. An empty name

node's map key or empty Map if none have been defined Since: JPA 2.1 Map getSubgraphs () Return ... with this attribute node or empty Map if none have been defined Since: JPA 2.1

a list of the grouping expressions. Returns empty list if no grouping expressions ... . Returns empty set if no roots have been defined. Modifications to the set do not affect the query. Return

JPA Method in javax.persistence.criteria.CriteriaBuilder Predicate isEmpty (    Expression  collection ) Create a predicate that tests whether a collection is empty . Parameters: collection - expression Return: is- empty predicate Since: JPA 2.0

JPA Method in javax.persistence.criteria.CriteriaBuilder Predicate isNotEmpty (    Expression  collection ) Create a predicate that tests whether a collection is not empty . Parameters: collection - expression Return: is-not- empty predicate Since: JPA 2.0

joins that have been made from this type. Returns empty set if no fetch joins have been made from ... this bound type. Returns empty set if no joins have been made from this bound type. Modifications

JPA Method in javax.persistence.AttributeNode Map getSubgraphs () Return the Map of subgraphs associated with this attribute node. Return: Map of subgraphs associated with this attribute node or empty Map if none have been defined Since: JPA 2.1

JPA Method in javax.persistence.AttributeNode Map getKeySubgraphs () Return the Map of subgraphs associated with this attribute node's map key. Return: Map of subgraphs associated with this attribute node's map key or empty Map if none have been defined Since: JPA 2.1

or empty list if none have been defined Since: JPA 2.1 String getName () Return the name of a named

JPA Method in javax.persistence.EntityGraph List getAttributeNodes () Return the attribute nodes of this entity that are included in the entity graph. Return: attribute nodes for the annotated entity type or empty list if none have been defined Since: JPA 2.1

parameters of the query. Returns empty set if the query has no parameters. This method is not required

JPA Method in javax.persistence.Query Set getParameters () Get the parameter objects corresponding to the declared parameters of the query. Returns empty set if the query has no parameters. This method is not required to be supported for native queries. Return: set of the parameter objects Throws

to the declared parameters of the query. Returns empty set if the query has no parameters. This method

that are included in the subgraph. Return: list of attribute nodes included in the subgraph or empty List

JPA Method in javax.persistence.Subgraph List getAttributeNodes () Return the attribute nodes corresponding to the attributes of this managed type that are included in the subgraph. Return: list of attribute nodes included in the subgraph or empty List if none have been defined Since: JPA 2.1

() Get the parameter objects corresponding to the declared parameters of the query. Returns empty set if the query

JPA Method in javax.persistence.criteria.AbstractQuery Set getRoots () Return the query roots. These are the roots that have been defined for the CriteriaQuery or Subquery itself, including any subquery roots defined as a result of correlation. Returns empty set if no roots have been defined

with all the four methods, keeping the methods that are irrelevant empty . For example: package test; import

.String field, empty collection, 0 size array, and so on). primary-key The primary-key attribute, defined

a new, empty database at that location. This behavior is an ObjectDB extension. JDO does not define

can be overridden, as demonstrated by user3 : Three attributes are changed. The empty address attribute

can even be constructed by an empty newQuery() form: Query newQuery(); However, a candidate collection

of the expression in the outer query. If the trimmed expression is the empty String ... unbound. If the trimmed value is the empty String, or the parameter is null, then JDOUserException ... the candidates over which the subquery is evaluated. If the trimmed value is the empty String, or

in the variableDeclaration unbound. If the trimmed value is the empty String, or the parameter ... is the empty String, or the parameter is null, then the candidate collection is the extent